Choice of operation mode

The IMEON hybrid inverter offers multiple operating modes (smart grid, on-grid, off-grid and backup) that can be configured from the IMEON OS. ONE application.

These operating modes have been integrated to meet requirements of various projects by changing the energy flow priorities.

The Smart Grid mode, which is the default mode, optimizes the self-production of the solar system by using photovoltaic production to supply the loads connected to the IMEON hybrid inverter, then charging the battery in case of solar production’s surplus. The loads will be powered by energy coming directly from the solar array, then from the batteries in case if solar production is not sufficient, then from the public grid in case batteries are discharged or charging. This mode of operation is meant to increase the self-production rate and make the house as autonomous as possible.

The backup mode prioritizes the charging of the batteries over self-production. This operating mode increases the availability of power stored in the battery and thus makes it possible to prolong the site’s autonomy in the event of grid outage. Photovoltaic production will be used primarily to charge the batteries, then to power loads connected to the IMEON hybrid inverter in case of surplus solar production and fully charged battery. The loads will be supplied by the surplus solar production supplemented, if necessary by the public electricity grid. The battery will be used only when the grid is not present. This mode of operation is recommended for a project on sites experiencing poor or unstable supply of electricity from the grid.

The On-Grid mode is used in the case of an installation without the storage. In this mode the inverter will simply feed the totality of the photovoltaic plant’s production to the loads using the electricity grid. The surplus production will be exported. The On-Grid mode may be used for systems that are yet to be equipped with storage or for ones where the solar array is under-dimensioned with respect to the load. In the latter case, the self-production capability is rather low whilst the photovoltaic self-consumption reaches a maximum of 100%. Since all photovoltaic production is consumed by the loads, there is no need to store energy.

The Off-Grid mode is used to electrify the so called isolated sites, having no connection to the public electricity grid. Photovoltaic production will be used to to charge the battery, the loads will be fed by PV production supplemented by the battery once the battery is ready for discharge. If the site requires uninterrupted power supply, the inverter can be coupled with an auxiliary GenSet, which will be triggered by the inverter’s built-in relay, to supplement the solar production after the battery reaches a predefined depth of discharge.